[Python知识库]python学习二十一（枚举+冒泡排序）

枚举

numerate()

numerate():函数用于一个可遍历的数据对象(如列表，元组或字符串）组合为一个索引序列

l1=['a','abc','jk','opop']

for index,value in enumerate(l1):
    print(index,value)

0 a
1 abc
2 jk
3 opop

for l in enumerate('happy'):
    print(l)

(0, 'h')
(1, 'a')
(2, 'p')
(3, 'p')
(4, 'y')

冒泡排序

#冒泡排序
numbers = [10,6,7,8,9,1,2,4,3]
temp=0
for i in range(len(numbers)):
    for j in range(i+1,len(numbers)):
        if numbers[j]<numbers[i]:
            temp=numbers[i]
            numbers[i]=numbers[j]
            numbers[j]=temp
        else:
            pass
print(numbers)

#冒泡排序
numbers = [10,6,7,8,9,1,2,4,3]
temp=0
for i in range(len(numbers)):
    for j in range(i+1,len(numbers)):
        if numbers[j]<numbers[i]:
            numbers[i],numbers[j]=numbers[j],numbers[i]#快速转换
        else:
            pass
print(numbers)